Pipes and Cistern Question & Answers
A water tank is two-fifth full.Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes.If both the pipes are open,how long will it take to empty or fill the tank completely?
|A) 6 min.to empty||B) 6 min.to fill|
|C) 9 min.to empty||D) 9 min.to fill|
Clearly,pipe B is faster than pipe A and so,the tank will be emptied.
part to be emptied = 2/5
part emptied by (A+B) in 1 minute=
so, the tank will be emptied in 6 min
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